using System.Collections;
using UnityEngine;
using UnityEngine.EventSystems;

/// <summary>
/// 버튼에 붙이면:
///  - 마우스가 올라오면 → 커짐 (Hover)
///  - 클릭하면 → 펀치 애니메이션
/// </summary>
public class ButtonHoverEffect : MonoBehaviour,
    IPointerEnterHandler, IPointerExitHandler, IPointerClickHandler
{
    [Header("Hover 설정")]
    public float hoverScale   = 1.15f;   // 커질 크기
    public float hoverSpeed   = 8f;      // 커지는 속도

    [Header("펀치 애니메이션 설정")]
    public float punchScale   = 0.85f;   // 줄어들 크기
    public float punchDuration = 0.12f;  // 한 방향 시간

    // ── 내부 상태 ──────────────────────────
    private Vector3 _originalScale;
    private bool    _isHovering  = false;
    private bool    _isPunching  = false;
    private Coroutine _punchCoroutine;

    private void Awake()
    {
        _originalScale = transform.localScale;
    }

    private void Update()
    {
        if (_isPunching) return;

        // 목표 스케일: 호버 중이면 크게, 아니면 원래 크기
        Vector3 target = _isHovering
            ? _originalScale * hoverScale
            : _originalScale;

        transform.localScale = Vector3.Lerp(
            transform.localScale, target, Time.unscaledDeltaTime * hoverSpeed);
    }

    // ── 마우스 진입 ────────────────────────
    public void OnPointerEnter(PointerEventData eventData)
    {
        _isHovering = true;
    }

    // ── 마우스 이탈 ────────────────────────
    public void OnPointerExit(PointerEventData eventData)
    {
        _isHovering = false;
    }

    // ── 클릭 시 펀치 ──────────────────────
    public void OnPointerClick(PointerEventData eventData)
    {
        if (_punchCoroutine != null)
            StopCoroutine(_punchCoroutine);
        _punchCoroutine = StartCoroutine(PunchRoutine());
    }

    private IEnumerator PunchRoutine()
    {
        _isPunching = true;

        Vector3 bigScale   = _originalScale * hoverScale;
        Vector3 smallScale = _originalScale * punchScale;

        // 1. 축소
        float elapsed = 0f;
        while (elapsed < punchDuration)
        {
            elapsed += Time.unscaledDeltaTime;
            transform.localScale = Vector3.Lerp(bigScale, smallScale, elapsed / punchDuration);
            yield return null;
        }

        // 2. 복원 (hover 크기로 돌아옴)
        elapsed = 0f;
        while (elapsed < punchDuration)
        {
            elapsed += Time.unscaledDeltaTime;
            transform.localScale = Vector3.Lerp(smallScale, bigScale, elapsed / punchDuration);
            yield return null;
        }

        _isPunching = false;
    }
}